<nav class="main-header navbar navbar-expand bg-white navbar-light border-bottom">
   <!-- Left navbar links -->
   <ul class="navbar-nav">
     <li class="nav-item">
       <a class="nav-link" data-widget="pushmenu" href="#"><i class="fa fa-bars"></i></a>
     </li>
     <li class="nav-item d-none d-sm-inline-block">
       <a href="index3.html" class="nav-link">首页</a>
     </li>
     <li class="nav-item d-none d-sm-inline-block">
       <a href="#" class="nav-link" style="color: red;">未开工</a>
     </li>
   </ul>

   <!-- SEARCH FORM -->
   <form class="form-inline ml-3">
     <div class="input-group input-group-sm">
       <input class="form-control form-control-navbar" type="search" placeholder="请输入..." aria-label="Search">
       <div class="input-group-append">
         <button class="btn btn-navbar" type="submit">
           <i class="fa fa-search"></i>
         </button>
       </div>
     </div>
   </form>

   <!-- Right navbar links -->
   <ul class="navbar-nav ml-auto">
     <!-- Messages Dropdown Menu -->
     <li class="nav-item dropdown">
       <a class="nav-link" data-toggle="dropdown" href="#">
         <i class="fa fa-comments-o"></i>
         <span class="badge badge-danger navbar-badge">3</span>
       </a>
       <div class="dropdown-menu dropdown-menu-lg dropdown-menu-right">
         <a href="#" class="dropdown-item">
           <!-- Message Start -->
           <div class="media">
             <img src="/dist/img/user1-128x128.jpg" alt="User Avatar" class="img-size-50 mr-3 img-circle">
             <div class="media-body">
               <h3 class="dropdown-item-title">
                 Brad Diesel
                 <span class="float-right text-sm text-danger"><i class="fa fa-star"></i></span>
               </h3>
               <p class="text-sm">Call me whenever you can...</p>
               <p class="text-sm text-muted"><i class="fa fa-clock-o mr-1"></i> 4 Hours Ago</p>
             </div>
           </div>
           <!-- Message End -->
         </a>
         <div class="dropdown-divider"></div>
         <a href="#" class="dropdown-item">
           <!-- Message Start -->
           <div class="media">
             <img src="/dist/img/user8-128x128.jpg" alt="User Avatar" class="img-size-50 img-circle mr-3">
             <div class="media-body">
               <h3 class="dropdown-item-title">
                 John Pierce
                 <span class="float-right text-sm text-muted"><i class="fa fa-star"></i></span>
               </h3>
               <p class="text-sm">I got your message bro</p>
               <p class="text-sm text-muted"><i class="fa fa-clock-o mr-1"></i> 4 Hours Ago</p>
             </div>
           </div>
           <!-- Message End -->
         </a>
         <div class="dropdown-divider"></div>
         <a href="#" class="dropdown-item">
           <!-- Message Start -->
           <div class="media">
             <img src="/dist/img/user3-128x128.jpg" alt="User Avatar" class="img-size-50 img-circle mr-3">
             <div class="media-body">
               <h3 class="dropdown-item-title">
                 Nora Silvester
                 <span class="float-right text-sm text-warning"><i class="fa fa-star"></i></span>
               </h3>
               <p class="text-sm">The subject goes here</p>
               <p class="text-sm text-muted"><i class="fa fa-clock-o mr-1"></i> 4 Hours Ago</p>
             </div>
           </div>
           <!-- Message End -->
         </a>
         <div class="dropdown-divider"></div>
         <a href="#" class="dropdown-item dropdown-footer">See All Messages</a>
       </div>
     </li>
     <!-- Notifications Dropdown Menu -->
     <li class="nav-item dropdown">
       <a class="nav-link" data-toggle="dropdown" href="#">
         <i class="fa fa-bell-o"></i>
         <span class="badge badge-warning navbar-badge">15</span>
       </a>
       <div class="dropdown-menu dropdown-menu-lg dropdown-menu-right">
         <span class="dropdown-item dropdown-header">15 记录</span>
         <div class="dropdown-divider"></div>
         <a href="#" class="dropdown-item">
           <i class="fa fa-envelope mr-2"></i> 4 新消息
           <span class="float-right text-muted text-sm">3 分钟</span>
         </a>
         <div class="dropdown-divider"></div>
         <a href="#" class="dropdown-item">
           <i class="fa fa-users mr-2"></i> 8 好友申请
           <span class="float-right text-muted text-sm">12 小时</span>
         </a>
         <div class="dropdown-divider"></div>
         <a href="#" class="dropdown-item">
           <i class="fa fa-file mr-2"></i> 3 新记录
           <span class="float-right text-muted text-sm">2 天</span>
         </a>
         <div class="dropdown-divider"></div>
         <a href="#" class="dropdown-item dropdown-footer">查看所有</a>
       </div>
     </li>
   </ul>
 </nav>